--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Widgets/FlyingFader.py	Wed Jul 03 09:37:57 2002 +0000
@@ -0,0 +1,191 @@
+from Tix import *
+from time import time,sleep
+from __future__ import division
+
+class Mass:
+    def __init__(self):
+        self.x=0 # position
+        self.xgoal=0 # position goal
+        
+        self.v=0 # velocity
+        self.maxspeed = .8 # maximum speed, in position/second
+        self.maxaccel = 3 # maximum acceleration, in position/second^2
+        self.eps = .03 # epsilon - numbers within this much are considered the same
+
+        self._lastupdate=time()
+        self._stopped=1
+
+    def equal(self,a,b):
+        return abs(a-b)<self.eps
+
+    def stop(self):
+        self.v=0
+        self.xgoal=self.x
+        self._stopped=1
+        
+    def update(self):
+        t0 = self._lastupdate
+        tnow = time()
+        self._lastupdate = tnow
+
+        dt = tnow-t0
+
+        self.x += self.v*dt
+        # hitting the ends stops the slider
+        if self.x>1: self.v=max(self.v,0); self.x=1
+        if self.x<0: self.v=min(self.v,0); self.x=0
+            
+        if self.equal(self.x,self.xgoal):
+            self.x=self.xgoal # clean up value
+            self.stop()
+            return
+        
+        self._stopped=0
+        dir = (-1.0,1,0)[self.xgoal>self.x]
+
+        if abs(self.xgoal-self.x) < abs(self.v*5*dt):
+            # apply the brakes on the last 5 steps
+            dir *= -.5
+
+        self.v += dir*self.maxaccel*dt # velocity changes with acceleration in the right direction
+        self.v = min(max(self.v,-self.maxspeed),self.maxspeed) # clamp velocity
+
+        #print "x=%+.03f v=%+.03f a=%+.03f %f" % (self.x,self.v,self.maxaccel,self.xgoal)
+
+    def goto(self,newx):
+        self.xgoal=newx
+
+    def ismoving(self):
+        return not self._stopped
+
+class FlyingFader(Frame):
+    def __init__(self, master, variable, label, fadedur=1.5, font=('Arial', 8), labelwidth=12,
+                 **kw):
+        Frame.__init__(self, master)
+        self.name = label
+        self.variable = variable
+
+        self.mass = Mass()
+        
+        self.config({'bd':1, 'relief':'raised'})
+        scaleopts = {'variable' : variable, 'showvalue' : 0, 'from' : 1.0,
+                     'to' : 0, 'res' : 0.001, 'width' : 20, 'length' : 200, 'orient':'vert'}
+        scaleopts.update(kw)
+        if scaleopts['orient']=='vert':
+            side1=TOP
+            side2=BOTTOM
+        else:
+            side1=RIGHT
+            side2=LEFT
+        
+        self.scale = Scale(self, **scaleopts)
+        self.vlabel = Label(self, text="0.0", width=6, font=font)
+        self.label = Label(self, text=label, font=font, anchor='w',width=labelwidth) #wraplength=40, )
+
+        self.oldtrough = self.scale['troughcolor']
+
+        self.scale.pack(side=side2, expand=1, fill=BOTH, anchor='c')
+        self.vlabel.pack(side=side2, expand=0, fill=X)
+        self.label.pack(side=side2, expand=0, fill=X)
+
+        for k in range(1, 10):
+            self.scale.bind("<Key-%d>" % k, 
+                lambda evt, k=k: self.newfade(k / 10.0, evt))
+
+        self.scale.bind("<Key-0>", lambda evt: self.newfade(1.0, evt))
+        self.scale.bind("<grave>", lambda evt: self.newfade(0, evt))
+
+        self.scale.bind("<1>", self.cancelfade)
+        self.scale.bind("<2>", self.cancelfade)
+        self.scale.bind("<3>", self.mousefade)
+
+        self.trace_ret = self.variable.trace('w', self.updatelabel)
+        self.bind("<Destroy>",self.ondestroy)
+
+    def ondestroy(self,*ev):
+        self.variable.trace_vdelete('w',self.trace_ret)
+
+    def cancelfade(self, evt):
+        self.fadegoal = self.variable.get()
+        self.fadevel = self.fadeacc = 0
+
+        self.scale['troughcolor'] = self.oldtrough
+
+    def mousefade(self, evt):
+        target = float(self.tk.call(self.scale, 'get', evt.x, evt.y))
+        self.newfade(target, evt)
+
+    def ismoving(self):
+        return self.fadevel!=0 or self.fadeacc!=0
+
+    def newfade(self, newlevel, evt=None, length=None):
+
+        # these are currently unused-- Mass needs to accept a speed input
+        mult = 1
+        if evt.state & 8 and evt.state & 4: mult = 0.25 # both
+        elif evt.state & 8: mult = 0.5 # alt
+        elif evt.state & 4: mult = 2   # control
+
+
+        self.mass.x = self.variable.get()
+        self.mass.goto(newlevel)
+
+        self.gofade()
+
+    def gofade(self):
+        self.mass.update()
+        self.variable.set(self.mass.x)
+
+        if not self.mass.ismoving():
+            self.scale['troughcolor'] = self.oldtrough
+            return
+        
+        # blink the trough while the thing's moving
+        if time()%.4>.2:
+            # self.scale.config(troughcolor=self.oldtrough)
+            self.scale.config(troughcolor='orange')
+        else:
+            # self.scale.config(troughcolor='white')
+            self.scale.config(troughcolor='yellow')
+
+#        colorfade(self.scale, percent)
+        self.after(30, self.gofade)
+
+    def updatelabel(self, *args):
+        if self.variable:
+            self.vlabel['text'] = "%.3f" % self.variable.get()
+#        if self.fadetimes[1] == 0: # no fade
+#            self.vlabel['fg'] = 'black'
+#        elif self.curfade[1] > self.curfade[0]:
+#            self.vlabel['fg'] = 'red'
+#        else:
+#            self.vlabel['fg'] = 'blue'
+
+    def get(self):
+        return self.scale.get()
+
+    def set(self, val):
+        self.scale.set(val)
+
+def colorfade(scale, lev):
+    low = (255, 255, 255)
+    high = (0, 0, 0)
+    out = [int(l+lev*(h-l)) for h, l in zip(high,low)]
+    col="#%02X%02X%02X" % tuple(out)
+    scale.config(troughcolor=col)
+
+if __name__ == '__main__':
+    root = Tk()
+    root.tk_focusFollowsMouse()
+
+    FlyingFader(root, variable=DoubleVar(), label="suck").pack(side=LEFT, 
+        expand=1, fill=BOTH)
+    FlyingFader(root, variable=DoubleVar(), label="moof").pack(side=LEFT,
+        expand=1, fill=BOTH)
+    FlyingFader(root, variable=DoubleVar(), label="zarf").pack(side=LEFT,
+        expand=1, fill=BOTH)
+    FlyingFader(root, variable=DoubleVar(), 
+        label="long name goes here.  got it?").pack(side=LEFT, expand=1, 
+        fill=BOTH)
+
+    root.mainloop()